Agregue este code en el primero frame del swf externo.
Código:
import flash.display.StageAlign;
import flash.display.StageScaleMode;
stage.addEventListener(Event.RESIZE, resizeHandler);
addEventListener(Event.REMOVED_FROM_STAGE, deadJim);
function deadJim(e){
stage.removeEventListener(Event.RESIZE, resizeHandler);
removeEventListener(Event.REMOVED_FROM_STAGE, deadJim);
}
function resizeHandler(e:Event):void
{
//center_mc.x = stage.stageWidth * 0.5;
//center_mc.y = stage.stageHeight * 0.5;
}
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.dispatchEvent(new Event(Event.RESIZE));